Least common multiple (LCM) of 10 and 20 is 20.
The Elementary Education Act of 1870 was the first of a number of acts of parliament passed between 1870 and 1893 to create compulsory education in England and Wales for children aged between five and 13. It was known as The Forster Act after its sponsor William Forster.
Sparta was the largest city-state in Greece in 700 BC
The brutal response of police was widely publicized: it was at the time when television started gaining importance and the protests were reported in the television (and radio) to the whole country.
This actually helped gain more sympathy for the protests and spread the knowledge about them so the people who were also in favor of civil rights knew there were not alone.